Table 4.
Results of the Kruskal-Wallis test comparing parameters describing the distribution of uncorrected and corrected relative cerebral blood volume (rCBV) obtained from whole-tumor regions of interest between the low- and high-grade tumor groups
| Parametersa | Tests between low- and high-grade tumor groups | |||||
|---|---|---|---|---|---|---|
| Uncorrected rCBV | Corrected rCBV | |||||
| Low-grade (mean±SD) |
High-grade (mean±SD) |
P-valueb | Low-grade (mean±SD) |
High-grade (mean±SD) |
P-valueb | |
| Skew | 0.94±1.05 | 0.89±0.72 | 0.725 | 1.25±1.11 | 1.01±0.80 | 0.573 |
| Kurtosis | 3.34±3.80 | 3.04±2.99 | 0.809 | 4.42±6.11 | 2.98±2.99 | 0.403 |
| 10th percentile | −2.08±6.82 | 0.36±2.05 | 0.000 | −0.20±2.34 | −0.86±1.09 | 0.154 |
| 25th percentile | −1.19±6.21 | 1.33±2.22 | 0.000 | 0.43±2.61 | −0.37±0.98 | 0.108 |
| 75th percentile | 1.18±4.76 | 3.51±3.23 | 0.002 | 1.60±3.19 | 0.66±1.18 | 0.011 |
| 90th percentile | 2.53±4.19 | 4.75±3.99 | 0.008 | 2.13±3.39 | 1.11±1.40 | 0.012 |
| Minimum | −5.19±9.67 | −3.00±3.74 | 0.117 | −0.84±2.09 | −0.82±2.41 | 0.285 |
| Maximum | 8.43±6.19 | 12.00±9.02 | 0.035 | 8.18±6.61 | 9.86±8.51 | 0.150 |
rCBV relative cerebral blood volume, SD standard deviation
aParameters include the skew and kurtosis in rCBV across the whole tumor, along with the values of percentiles obtained, for example, the 10th percentile value is the value below which 10% of all values in the whole-tumor region of interest lie
bP-value <0.05 is significant (bold)